Drilling-machine.



110,725,645. PATENTED APR.. 14, '1903.

A. W. WIGGLESWORTH. 1

DRILLING MACHINE.

APPLIOATION HLBD ma. 1902. no 10mn.. v 5 SHEETS-SHEET 1,

il .a

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* PATENTED APR. 14, 1903. A. W. WIGGLESWORTH.

DRILLI'NG M'AGHINE. y APPLIUATION FILED nu. a, 1902.

H0 MODEL.

I. QUUIIIIIIIU.,

V llllllllilllll um mum ///////m zly @fied/forli: f @mw/g No. 725,645. PATENTED APR. 14, 1903.

A. W. WIGGLESWORTH.

DRILLING MACHINE.

APPLIUATION rILnD MAR. a, 1902. no MODEL. 5 SHEETS-snm s.

me mums mais lcu, nuorouwu, wAsHmcro, n4 c No. 725,645. PATENTED APR. 14, 1903.

A. W. WIGGLESWORTH.

DRILLING MACHINE.

APPLICATION FILED MAR. 8, 1902.

N0 MODEL. 6 SHEETS--BHEET 4.

v v C A" I www N0.,725,6455 Y PATBNTED A1 R.14,19os.y

A1 W. WIGGLESWORTH.

DRILLING MACHINE;

APPLIoA'rIoN FILED MAB. s, 1902. No MODEL. l 5 SHEETS-SHEET a.

Limo., wAsmNcYoN n c lUNTTED STATES PATENT OFFICE.

ALBERT W. WIGGLESWORTH, OF CHICAGO, ILLINOIS.

`DFlILLlNG-IVIACHINE.

SPECIFICATION forming part of Letters Patent N O. 725,645, dated April 14, 1903.

Application iiled March 8, 1902.

T0 LZZ wwn/b it may concern:

Be it known that I, ALBERT W. WIGGLES- WORTH, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Drilling-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this speciiication.

This invention relates to improvements in drilling-machines.

Certain of the features of myimprovements have been designed more specifically for use in connection with radial drills or drills wherein the main column or support thereof is provided with a horizontal overhanging arm or beam which is movable vertically on said column. My invention embraces an improved means for raising and lowering the overhanging arm of the drill of this character and also an improved counterweight for the drill-spindle, which is also applicable to drills of other types.

The invention consists in the matters hereinafter setforth, and more particularly pointed out in the appended claims.

In the drawings, Figure 1 is a side elevation of the principal parts of a drilling-machine embodying my improvements. Fig. 2 is a transverse sectional and elevational View taken on line 2 2 of Fig. 1. Fig. 3 is a vertical section taken through the principal parts of the raising and lowering devices for said arm or beam, this view being taken on line 3 3 of Fig. 2. Fig. 4 is a transverse section taken on line 4 4 of 3. Fig. 5 is a transverse section taken on line 5 5 of Fig. 3. Figs. 6 and 7 are views, partly in section aud partly in top plan, of the bearing-bracket in the hollow slide-block C' of the radial arm C of the drill in which theshaft g2 and L are supported. Fig. 8 is a partial end elevation of the drilling-machine looking toward the end of the overhanging arm or beam which supports the drill-head. Fig. 9 is a detail illustrating the connection between the drillspindle and the counterbalauce-weight. Fig. 10 is a transverse section taken on line l0 10 of Fig. S. Fig. 1l is a partial end 'elevation of a drilling-machine looking toward the end Serial No. 97,278. (No model.)

of the overhanging arm or beam which supports the drill-head. Fig. 12 is a detail illustrating the connection between the drill-spindle and the counterbalance-weight. Fig. 13 is a transverse section taken on line 13 13 of Fig. 11.

' As shown in said drawings, and referring more particularly to Fig. 1, A designates the base of the drill; B, a vertical column supported and rotatively connected at its lower end in any suitable manner with said base. C designates an overhanging beam or arm, which carries a drill-head (indicated as a whole by D) and in which drill-head are mounted a drillspindle E and suitable driving mechanism by which the same is rotated from the main shaft of the machine, as will hereinafter more fully appear. The inner end of the arm C consists of a hollow cast-metal slide-block C', which has interiitting engagement with vertical ways B ou the column B,

as shown in Figs. 1 and 8, permitting said arm to slide vertically on said column. For this purpose the inner end of said slide-block is provided at its sides with recesses or rab` bets c, as shown in Fig. 3, and removable plates ca are attached, Fig. 1, to the rear margins of said block and engage the rear faces of said guides or ways B' and between which and the body ofthe block are formed grooves occupied by said guides or ways. The overhanging arm or beam C is similarly provided with guides or ways C2, with which the baseplate D' of the head has interlocking connection, said plate being provided with an undercut groove, which fits over the ways of said arm or beam, as shown in Fig. S. The head carrying the spindle is adapted to swivel completely around 0n its base or saddle iu a manner common to machines of this type, so as to change the angular position of the drillspindle to any point desired in a plane parallel with the plane of the axis of the arm. Said arm is also connected with the slideblock C', so as to be rotatively adjustable thereonand thereby vary the angular position of the'drill-spindle in a plane transverse to the axis of said arm. For this purpose the IOO arm proper is connected with the block Cl by F designates a short Vvertical driving-shaft which is journaled in a bearing-casting B2 at the upper end ofthe column B. Said driving-shaftr is connected with a vertical rotative shaft G through the medium o'f a gear-pinion F Aon the shaft F, a gear-pinion g on the shaft G and an idler F2 meshing with the pinions F and g. Said shaft Gis rotatively mounted at its upper end in a short vertical bearing-sleeve b' and at its lower vend in a'v'ertitical bearing-sleeves at the top of the sliding block 4 O' of the drill-supporting-arm or beam. The shaft Gis operatively connected with the drill-spindle E by means ofhorizontal shafts E' E2' and a beveled gear-wheel E3, as willhereinafter more fully appear. The

shaft G is madeof two parts or sections, anl

upper part g' and a lower part g2, as shown in Fig. 3, the upper part carrying the gear-A pinion g. Saidupper section ofthe shaft slides in the gear-pinion g, being for this purpose provided with akey or spline g3. l Said upper and lower sections of the shaft are con? nected Aby means of a sleeve G', Fig. 3,- areduced part thereof having rotative bearing in the vertical bearing-sleeve c', before referred to. Said connecting-sleeve G is nonrotatively afxed to the lower end of the upper shaft-sectionl g' by a transverse pin ge, and the lower'section of said shaft is ai'xed non-rotativelyto said con meeting-sleeve, but has longitudinal' sliding engagement therei with, permitting said lower section to move als toward and from the upper-.section thereof. Said sleeve is provided below the bearing c with the collar g5, the sleeve extending below said bearing and said collar being rigidly attached to the bearing and serving as a stop Lto prevent thesleeve rising out-of its bearing. Said `lower section of the shaft Gr extends downwardly from the bearing-sleeve c' through other, bearings 'c2 c3, Fig. 3, which areformed integral withthe cast-metal slidingblock of the drill-spindle arm. Loosely mounted on said shaft between-said bearings c2 c3- are upper and lower beveled gear-wheels associated'bearing c3 and is provided with a the shaft-section g2 and areadapted to be y stop-collarIjIS, which is non-rotativelysecul red to' said sleeve-section'. Said gear-wheels H lfl,la`s before stated, are loosely mounted on separately locked tosaid -shaft through the medium of a suitabler clutch mechanism. Said clutch mechanism isV made {as follows:

proximate faces with circular tapered recesses h2 h3.

I designates a short sleeve which is immovabiy fixed on the shaft-section g2. Surrounding the ends of said sleeve I are upper and lower split expansible rings I I2, which are tapered and adapted to enter, respectively, the recesses h2 h3 in the proximate faces of the gear-wheels H H. The expansible rings I I2 are movable endwise on said sleeve I and are prevented from slipping out of engagement with said sleeve by means of curved radial flanges il i on the rings and oppositelydirected curved radial' flanges v? t3 at, the ends of the collar in the mannershown in Fig. 3. Said split rings are adapted to be held normally separated by means of spiral expansion-springs l3 I3, interposed therebetween. 4The anges on the sleeve and rings, respectively, are separated by corresponding intervening spaces, and the rings are slipped on the sleeve from the end thereof, at which time the flanges of the rings lare turnedin aline'rnent with the spaces between the flanges of the sleeve, and after the ri'ngs have been slipped over the sleeve they are turned to bring the danges thereof in alinement with those of the sleeve. The openings or spaces between the endsof the split rings 112 are made tapering,and said spaces are occupied by the upper and lower ends of a stationary key J, which is afxed to the sleeve I by means of screws. Said screws pass through the sleeve and into the shaft-section g2 and afford means by which the sleeve'is affixed to said Ashaft-section. When the clutch-collar is in its intermediate position, as shown in Fig. 3, the springs I3 act to hold said expansible rings in IOO their' outermost position against the flanges t2 113 and with their outer ends entering 'the sockets Vin the faces of the gear-wheels I-I H. In this position ofthe parts said split rings enter slightly the recesses 71,271.3, but are not in contact with the Walls of said recesses, so that rotation of the shaft-section is not communicated therethrough to either of the gear-wheels.l When it is desired to lock one of said gear-wheels to the shaft, the sleeve is moved toward that one of the gear-Wheels which is to be locked to the shaft. Inasmuch as, the sleeve is shown as fixed tothe shaft, such movement of the sleeve is herein accomplished by endwise movement of the shaft. Upon moving said sleeve towardnthe gearwheel to be locked to the shaft the expansible I ringon the end of said sleeve toward which the sleeve is moving by reason of the presence 'of the springs'l3 is caused to further enter the socket or recess in the adjacent gearwheel until limited by contact thereof with the'bottom of the recess. When the advance end of said ring comes into contact with the bottom of said socket and the movement of said ring is thereby arrested, the wedge or inclined :keyJ continues its movement, said Wedge or'key 'acting against the ends of said The gear-wheels I-I IIare providedon'their split ring to expand the same into intimate IIO contact with the tapered side Awalls of: the socket. At this time the shafts E2 and E are rotated through the medium of the gear-Wheel H or II',Which is locked to the shaft, and the gear-wheel E3, which latter is at all times in mesh with the gear-wheels H H', and the gearwheel which is not locked to the shaft rotates loosely on the shaft. When it is desired to reverse the direction of rotation of the drillspindle E, the clutch device described is moved out of contact with the gear-wheel engaged therewith and into contact with the other gear-wheel, this operation acting to release the first-mentioned gear-wheel and'lock the second gear-wheel to the shaft, and thereby change the direction of rotation of the drill-V spindle. When it is desired to stop the ro- 1tation of the drill-spindle, the clutch device is moved into its intermediate position, as shown in Fig. 3, atwhich time the lower shaft-section willcommunicate no motion to either of the gear-wheels H or H. In the construction herein shown the clutch device is moved into'aud out of engagement with the gear-wheels H and H' through bodily endwise movement of the shaft-section g2. Said shaft-section is given longitudinal movement through the following devices:

K designates a short rock-shaft which is journaled in a bearing in the slide-block C',

as shown in Figs. l and 3. Fixed to saidrockshaft is an arm K', which is bifurcated Vat its outer end and the members k of which pass' on either side of the shaft-section g2. Surrounding said shaft-section at the levelof the arm K is a collar G2, which is shown as nonrotatively mounted on the shaft 'by means of a transverse pin g4' extending through said collar and shaft.

K2 K2 designate the two parts of a split ring which occupies an annular groove in the outer face of the collar G2. lo' lo designate setscrews which extend laterally through screw-threaded openings in the outer ends of the members lo of the arm K and bear at their inner ends against the parts K2 of said split ring.

The rock-shaft K is provided outside of the slide-block C with a rigidly-attached lever K3, Fig. l, by which said rock-shaft is rocked to impart to the shaft-section g2 'Vertical' movement and therethrough actuate the clutch mechanism. Said hand-lever K3 is providedwith a familiar form of springpressed lockingpawl, which cooperates with a notched segment to hold said lever in either one of its three positions of adjustment, as

shown in Fig. l. j

The driving connection between the shaft E and spindle E are such as to maintain their proper operative relation in all of the angular positions of the head on the arm and in all the adjustments ot' the head on the arm, longitudinallyconsidered. These featuresof construction constitute no part of my present invention and arenot illustrated.

D, Figs. l and 8, designates an obliqueV shaft whichV is journaled in its lower end in bearings formed on the head Dand on its upper end in a bearing d, located at the. upper end of a vertical standard D2, rising from said head. Said shaft is provided near its upper end with a gear-pinion d', which meshes with a gear-wheel d2, affixed to oneend of a short horizontal shaft D4, Fig. 10, which is journaledina bearing inthe upper end of said standard D2. The end of said short shaft remote from the gear-wheel d2 is provided with a gear-pinion d3, which meshes with a rack e, formed on a bar E, which moves endwise with the spindle E, but isv nonrotative.l Said bar .has sliding engagement with a vertical bearingin the upper end of the standard D2 and is connected, by means of a rotative joint e at its lower end, with the upper end'of the drill-spindle E. The shaft D3 is provided at its lower end, adjacent to the head, with a worm-wheel D5, which is adapted to engage a horizontal worm-shaft v D6, Fig. 1, which has suitable bearing in the head D and which is operatively connected through a change-speed mechanism` (indicated as a whole by D9) with'the shaft E. Through the mechanismdescribed the drillspindle E is adapted to be fed gradually end-- wise to its work or retracted therefrom through the medium of the shaft E', which latter directly rotates the spindle E in the manner before described. The Worm-shaft D6 is provided on its outer end with a handwheel D7, through which power may be applied to advance the drill-spindle more rapidly than the automatic mechanism described.

The drill is adapted to be retracted from its Work or to be advanced toward the same when the drill is out of the work and more rapidly than by the means just described IOO through the medium ofa hand-wheel D5,which is affixed to the lower dof the shaft D3 below its bearing inthe he d.` Poweris'applied through said wheel D8 directly to the shaftvv D3, so that upon' rotatio of said shaft through the medium ofthe saidwheel the drill-spindle'is rapidly retracted from and advanced to its work.

In connection with the feed' mechanism described lI have provided a counterweight mechanism for counterbalancing the weight of the spindle and the parts which move therewith, so that the same is perfectly balanced in all the angular positions of the drillspindle and may be readily raised andv low` ered. Said mechanism is made as follows:

E5 designates aweightwhich'ha's sliding engagement with a bearing e2, formed on the TIO Ivzo

upper end of the standard D2. weight,v is provided on one'side thereof with a series of teeth e3, forming a rack which is adapted to be engaged by the pinion d3 on theshaft Dt, before referred vto and shown in Figs. v9 and 1 0.

` It will be seen that the bar E4 and the counterbalance-Weight E5 are directly connected through the interposed pinion d3, so that'when one of said parts is raisedl the other part is correspondingly lowered, and vice versa. The weight E5 is so proportioned with respect to the weight of thespindle and its associated parts-to wit, the bar E4, thedrill-chuck, and drillas to balance said parts, so that said spindle may be raised or lowered with Alittle power. yBy reason of the connection of said weight Awith the spindl'e-shaftiin the manner described both ends of the weightare free, and counterbalancing movement is `trans-l mitteddirectly from Athe weightto the spindle through the intervening pinionby movement of the weightrin either direction of its length, and the proper balance of the spindle is maintained notwithstanding the angular position of the spindle with respectto its axis of adjustive rotation. f

Means are provided for automatically raising and lowering theuoverhangingsarm or beam C which carries the drill-head, said means being actuatedv through mechanism operatedlby the driving and reversing mechanism, made as follows:I t

L designates a vertical 'screW- threaded shaft located between .the column B and shaft ,G andwhich.v is attached at 'its upper ,end to the bearing-bracket B2 'at theupper end of the column B, as shownin Fig. l, said shaft being suspendedfrom the bracket. L', Fig. 3, designates an interiorlyscreW-threaded sleeve, through which said shaft extends and with which it has screw-threaded .en`- gagement. Said sleeve L' is rotatively mounted in a vertical bearing c4, which is made integral with the bearing c2, hereinbefore referred to. The sleeve is provided at its lower end below the bearing with an annular iiange Z', forming a supporting-shoulder, and interposed between said fiange and bearing is an antifriction-.bearing consisting of two rings-Z, having opposing annular recesses and balls Z2 located in said recesses. Said shaftL receives, through the sleeve L' and the bearing c4, the weight of the karm or beam C, the arm being guided by its connection with the column. Attached to the upper end of said sleeve L', above the bearing c4, is a gear-Wheel L2,which meshes with a gear-pinion M, which is formed on the lower end of the sleeve M', whichlatter surrounds the shaft-section g2 just below the coupling-sleeve G'. Said sleeve M' is loosely mounted on the shaft-section g2, so that the shaftsection turns freely therein and the sleeve slides longitudinally of the 4shaft-section. The adjacentfaces of the gear-pinion M and the collar H2 at the upper end of the sleeve h, respectively, are provided with vprojecting parts or lugs m h", which are adaptedl to interlock to form a spur-clutch, .wherebyrwhen Asaid parts are moved into engagement one with the other rotative movementv imparted through the sleeve h is transmitted through the gear-wheel M and .thegear-wheel L2 to the sleeveL',l and'rotation of said sleeveion said stationary shaft causes the arm C to be raised or lowered, depending upon the direction of rotation of the sleeve. The members of said spur-clutch are interlocked through longitudinal movement of the sleeve M on the shaft-section, the devices for this purpose being provided as follows: N, Fig. 3, designates a rock-shaft which is mounted in suitable bearings in the cast-metal slide-block C', and N' designates an arm rigid with said shaft and projecting inwardly toward the sleeve or collar M. The inner end of said arm N' is bifurcated similar to the arm K', before described, and the members n thereof pass on opposite sides of the sleeve or collar M'. The connection of the said arm with the sleeve M' is similar to the connection of the arm K' with the sleeve G2, before described, said members of the arm being provided with set-screws n', asshown in dotted linesin Fig. 3, which engage at their inner ends the parts M2 of a split `ring which occupies a groove in the cylindric outer part of the sleeve or collar M'. Attached to said rock-shaft N outside of the cast-metal slide-block is a lever N2, Fig. l, by which the rock-shaft and associated parts are operated to throw the clutch into and out of their locking relation. Any suitable meansmay be employed for locking said le- Ver in its adjusted position-as, for instance,

apin n2, which is adapted to engage shallow` notches c5 in the adjacent face of the slideblock C', one of said notches being shown in Fig..l. `When the lever occupies a vertical position, as shown in said Fig. l, the clutch members are in interlocking engagement, and when thrown to the left of the position shown in Fig. l and locked therein said clutch members are moved out of the interlocking connection. The extent of movement Aof the combined clutch member andgear-wheel M -is such that when moved out of engagement with the associated clutch member the gearwheel M remains in mesh with the gear-wheel L2, as shown. in Fig. 3. VViththis construction'fwhen it is desired to raise or lower the radial drill-head-supporting arm the clutch member M is lowered to bring the same into interlocking engagement with the associated clutch member formed by the ring H2, whereby the rotation of the driving and reversing mechanism is imparted to the screw-threaded sleeve L',which, rotating on the shaft L,causes said sleeve and the arm C supported thereon to be raised or lowered, depending upon the direction of the rotation of said sleeve.

The construction described for controlling ICO IIO

the drill-spindle driving and reversing mechanism and for controlling therefrom the raising and lowering devices of the overhanging arm is a very simple one and enables all of said operations to beeffected by the use of but two manually-operated parts-to wit, the levers K3 N3. When the lever K2 is in an intermediate position, as shown in Fig. l, no motion is communicated from the drivingshaft G to the drill-spindle. v Said shaft G is adapted to be operatively connected with the drill-spindle to rotate thev spindle in either direction by moving said actuating-lever K3 to one of its limits of movement, and thereby throwing the clutch mechanism into operative connection with either one of the beveled gears H or H. When it is desired to raise or lower the arm C, the lever N3 is swung on its axis of vibration to bring the clutch member actuated thereby into operative relation with its companion clutch member, so as to transmit rotative motion to the gear-wheel L2 and sleeve L', and the lever K3 is actuated to operate the clutch mechanism associated with the gear-wheelsH H to give the proper direction of rotation to said gearwheel and sleeve to thereby raise or lower the arm, as desired. If the clutch mechanism associated with the' gear-wheels II H be moved into contact with the upper gear-wheel H, motion is communicated directly to the upper clutch through the sleeve 7L, while if said clutch mechanism is moved into engagement with the lower gear-Wheel II' motion is communicated to said lower clutch mechanism and to the sleeve L through the medium of the gearwheels- II', E3, and H and the direction of rotation of said upper clutch is reversed.

An advantage of the form of friction-clutch herein shown is that the friction members are moved entirely out of contact with each other when the clutch is released, so that there is no wear on the friction-rings or the coperating surfaces of the gear-wheels when the clutch is out of action.

It is obvious that the details of construction, as well as the arrangement and proportioning of the parts, may be considerably; varied without departing from the spirit of my invention, and I do not limit myself tol hereinafter made the such details except as subject of specific claims. For instance, the counterweight may be employed on a boringmachine and the construction of the parts,

varied to suit such adaptation.

I claim as my inventionl. In a radial drilling-machine,

the combi.

nation with a column or support, a radial arm l which has sliding connection therewith, a y

drill-head supported on said arm, a drill-spindle in said head, and driving and reversing; mechanism for said spindle located at the in- Z ner end of said arm, of raising and lowering mechanism for said arm and operative connections between said raising and loweringmechanism and the driving and reversing mechanism located at the inner end of said arm. r

2. In a radial drilling-machine, the combination with a column or support, a radial arm which has sliding connection therewith and having a hollow inner end, a drill-head mount- Y ed on said arm, a drill-spindle in said head, an operating-shaft mounted on said column or support, and operative connectionsbetween said operating-shaft and drill-spindle embracing a reversing mechanism located atthe inner end or base of said arm, of mechanism for raising and lowering said arm, andv op- 'wheel, and

erative connections contained within the inner end of said arm between said raising and lowering mechanism and said driving and reversing mechanism.

3. In a radial drillingmachine, the combination with a column or support, a radial armv which has sliding engagement therewith, a drill-head mounted on said arm, a drill-spindle in said head, an operating-shaft mounted on said column or support, and operative connections between said operating-shaft and drill-spindle embracing a vreversing mechanism located at the inner end of said arm, of an upright screw-threaded shaft mounted on said column or support which supports said arm,and operative connections located at the inner end of said arm between said screwthreaded shaft andsaid reversing mechanism.

4. In a radial drilling-machine, the combination with a column or support, a radial arm which has sliding connection therewith, a drill-head mounted on said arm, a drill-spindle in said head, an operating-shaft mounted on said column or support and operative connections between said operating-shaft and drill-spindle embracing 'a reversing mechanism located at the inner end of said arm, of an upright screw-threaded shaft mounted on said column and supporting said arm, and operative connections between said screwthreaded shaft and said reversing mechanism, embracing a clutch mechanism located at the inner end of said armand manuallyoperable means for actuating said clutch mechanism.

5. In a radial drilling-machine, the combination with a column or support, a radial arm which has sliding connection therewith, a drill-head on said arm, a drill-spindle in said head, driving and reversingl mechanism for said drill-spindle located at the inner end of said arm, and a single, manually-operable part for operating said driving and reversing mechanism constructed to disconnect the driving mechanism from the drill-spindle or connect the same therewith to rotate the drillspindle in either direction, of mechanism for raising and .lowering said arm,*and operative connections located at the inner end of said arm between said raising and-lowering, mechvanism and the driving and reversing mechanism operated by a single manually-operable part.

. 6. In a radial drilling-machine, the combination with a column or support, a radialarm which has sliding connection therewith, a drill-head on said arm, a drill-spindle in said head, and an upright rotative shaft mounted on said column or support, of a non-rotative screw-threaded shaft supported on said co1- umn and on which the weight of said arm is sustained, a screw-threaded sleeve surround- :ing said shaft and having bearing with the inner end of said arm, a gear-wheel on said sleeve, a gear-pinion meshing withsaid geara clutch mechanism llocated at IOS IOS

IIO

the inner end of said armadapted to connect said gear-pinion witha' part which rotates with said operating-shaft.

7. In a radial drilling-machine, the combination with a column or support, a radial arm which -has sliding connection therewith, a drill-head on said arm, a drill-spindle in said head, an operating-shaft and operative counections between said operating-shaft and the drill-spindle,of an upright non-rotative screwthreaded shaft mounted `on said column or support, a screw-threaded sleeve engaging said shaft and having bearing in said arm, a gear-wheel on said sleeve, a sleeve loosely surrounding the operating-shaft and provided with agear-pinion meshing with said gearwheel, a second sleeve constituting part of the operati ve connection between the operating-shaft and drill-spindle, said second sleeve surrounding said operating-shaft and adapted to turn therewith and also to be rotated in a direction the reverse of that of the operatingshaft, said two sleeves constituting members of a clutch mechanism which are adapted to be brought into engagement by movement of one of said sleeves endwise on said shaft.

8. In a radial drilling-machine, the combination with a column or support, a radial arm which has sliding connection therewith, a drill-head on said arm, a drill-spindle in said head, an operating-shaft and operativeconnections between said operating-shaft and drill-spindle embracing a reversing mechanism,of an upright non-rotative screw-threaded shaft mountedon said column or support, a screw-threaded sleeve engaging said screwthreaded shaft in the arm, a bearing in said arm in which said screw-threaded sleeve is mounted, a gear-wheel on said screw-threaded sleeve, a gear-pinion meshing with said gearwheel, a rotative part constituting a portion of said reversing mechanism,and clutch members formed on said part and on the gear-pinion which are adapted to be brought into operative engagement by movement of one of said parts toward the other part.

9. In a radial drilling-machine, the combination witha column or support, a radial arm, which has sliding connection therewith, a drill-head thereon, a drill-spindle in said head, and an operating-shaft, of two opposing beveled gear-wheels mounted in bearings in said arm through which said shaft loosely extends, a third gear-wheel meshing with said opposing gear-wheels and operatively connected with the drill-spindle, a clutch mechanism for separately locking said gear-wheels to said shaft, raising and lowering mechanism for said arm, and operative connections located at the inner end of the arm between said reversing mechanism and the raising and lowering mechanism.

10. In a radial drilling-machine, the combination with a column or support, a radial arm which has sliding connection therewith, a drill-head on said arm, a drill-spindle in said head, and an operating-shaft, of two opposing beveled gear-wheels loosely mounted on said shaft and rotating in bearings in the inner end of said arm',l a gear-pinion meshing with said gear-wheels and operatively connected with the drill-spindle, a friction-clutch device on said shaft between said gear-wheels adapted to be separately moved into operative engagement with said gear-wheels by endwise movement of the shaft, raising and lowering mechanism for said arm, and operative connections located in the inner end of said arm between said reversing mechanism and raising and lowering mechanism.

11. The combination with a drill head, means for raising and lowering the same and a drill-spindle rotatively mounted in said head, of a counterweight carried by and movable with the head and having sliding engagement therewith, and a gear connection between said spindle andcounterweight and acting directly on said spindle to counterbalance the latter.

12. The combination with a drillhead, means for raising and lowering said head and a drill-spindle rotatively mounted in said head, of a counterweight carried by and movable with said head vand having sliding engagement therewith, a non-rotative part connected with said spindle, a rack on said part, a rack` on the counterweight, and a pinion interposed between and meshing with said racks.

13. The combination with a drill-head, a drill-spindle rotatively mounted therein, a non-rotative part connected with said spindle, a rack on said part and feed mechanism for advancing and retracting the spindle embracing a rotative pinion meshing with said rack, of a counterweight and a rack on said counterweight with which said pinion meshes.

14. The combination with a drill-head, a spindle rotatively mounted therein and means for angularly adjusting said spindle on an axis transverse to its longitudinal axis, of a counterweight carried by said head and having sliding engagement therewith in two opposing directions, and gear connections between said counterweight and spindle and acting directly upon the spindle to transmit a counterbalancing action to the spindle in all angular adjustments ofthe spindle.

15. The combination with a drill-head, a spindle rotatively mounted therein and means for angularly adjusting said spindle throughout the entire sweep of a circle, of a counterweight carried by said head and partaking of the angular adjustment of the spindle, and gear connections between said counterweight and spindle constructedA to transmit a counterbalancing action from the counterweight directly to the spindle in all the angular adjustments of the spindle.

16. The combination with a drill-head, a drill-spindle which is rotative and endwise movable in said head, and a part which moves endwise with said spindle but is non-rotative, of an arm on said head in which said spindle IOO IIO

gear connections between said counterweight and the part which moves endwise with the spindle.

In testimony that I claim the foregoing as my invention I affix my signature, in presence of two Witnesses, this 28th day of Feband the parts connected therewith have bearing, a counterweight, a guide on said arm in which said counterweight s1ides,raeks on said counterweight and on the part which moves endwise with the spindle, and a gear-pinion -i interposed between said racks.

17. The combination with a rotative endruary, A. D. 1902. wise-movable spindle, a part which moves ALBERT W. WIGGLESWORT'H. endwise with said spindle, a rotative joint Vitnesses: connecting said parts, a counterweight which WILLIAM L. HALL,

GERTRUDE BRYCE.

has sliding engagement with the head, and 

